ADS4249EVM Square shape signal input but strange shape output

Dewen Duan

Prodigy 50 points

Dear Sir,

I used ADS4249EVM combine with TSW4806EVM and TSW1405EVM for analog signal detection, but when I input square shape signal, I got some output signal quite not like square shape(code form), can you please tell me how to adjust it to get the right output?

Output when input is square shape signal

while input is sine wave signal, it seems ok

over 8 years ago

0 jim s over 8 years ago

TI__Guru* 91947 points

Dewen,

This is due to the AC caps and transformers on the front end of the analog path of the EVM. If the board was setup for a true DC coupled application, you would see a square wave.

Regards,

Jim

0 Dewen Duan over 8 years ago in reply to jim s

Prodigy 50 points

Thanks Jim,

But how can I setup this Boad for true DC coupled. Thank you!

Best regards,

Dewen

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ADS4249EVM Square shape signal input but strange shape output

Dear Sir,

I used ADS4249EVM combine with TSW4806EVM and TSW1405EVM for analog signal detection, but when I input square shape signal, I got some output signal quite not like square shape(code form), can you please tell me how to adjust it to get the right output?